LED technology initiates in the same art of engineering that gave us mobile phones, computers and all modern electronics equipment based on quantum phenomena. Extending semiconductor devices to new compounds has produced great benefits to human life, as exemplified by modern optoelectronic and high-speed electronic devices for communications attained by Zinc Oxide, Blue LED etc. Engineers use a blue LED to excite some kind of fluorescent chemical in the bulb. That converts the blue light to white light. To harvest these advantages in real devices, a reliable technique for fabricating p-type...

In this book, the time reversal focusing based on finite difference time domain (FDTD) method to localize source by using MATLAB GUI. There are three analyses of free space model, waveguide model and user define model for source location in a perfectly matched layer boundary. The simulation results are evaluated to localize the source by using FDTD method in this book. This book is appropriate for analyzing the time reversal mirror implementation. We have shown the energy spectrum for propagation of acoustics wave in a room to focus by using array of transducers and source. In these plots we...